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Pastimes : Auto Repair & Maintenance Tip -- Ignore unavailable to you. Want to Upgrade?

To: WTMHouston who wrote (73)	11/6/1999 1:11:00 PM
From: Cheeky Kid	Respond to of 134

Troy, I'm no auto mechanic, my expertise is in the body / claims side of it. (20 years next spring) I find it useful to keep up with different problems people have with autos so if I am ever in the situation that I have to determine if it is accident related, it makes my call easier. I found this on a quick search on the Internet. BMW 3 & 5 Series shimmy cbsgi1.bu.edu home.earthlink.net Message to SI Admin (Bob) We should have an automotive section, so when this topic grows, which I believe it will, we can use the searchable data base to find solutions to problems discussed here.

To: WTMHouston who wrote (73)	11/6/1999 2:16:00 PM
From: kormac	Read Replies (1) \| Respond to of 134

Hello Webmister and Troy I am a mechanical engineer, but not any kind of specialist in automotive engineering. I have through the years tried to learn something about keeping my cars running, but have only paid enough attention to understand ONLY the most common problems. Troy, your methane exhaustion system illustrates the nature of pressure waves well. So if you happen to exhaust at the same time as someone near you, the two pressure waves collide and you do not get the nice kind of wave motion in one direction that you would get in a stratified charge engine. This BTW is why the Honda engines have a precombustion chamber. The idea is to get the pressure wave to propagate evenly to the top of the cylinder where the energy from the combustion can be converted to mechanical energy of the piston. If you can't get this done efficiently, the energy leaves the cylinder as HOT exhaust gases and a load on your cooling system. Thus the efficiency of the engine goes to the "pot" i.e. the same place that the methane exhaust system should discharge. :-) I have a 1992 BMW 325i and I have not experienced the problem with shimmy. It has had a problem with the ignition switch ruining the starter motor 3 times so far. Last time the ignition switch got changed and hopefully this will not happen again. Ron, I did not know that today cars have sensors that detect knock and adjust the spark advance. Interesting ! cheers, Seppo

To: WTMHouston who wrote (73)	11/6/1999 5:27:00 PM
From: Terry Whitman	Read Replies (1) \| Respond to of 134

WTM, Have you replaced your rotors? I understand that many braking shimmies are caused by rotors that have overheated and warped. It has become a larger problem with newer asbestos-free pads, because they do not dissipate the heat as well. FWIW, TW